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40+20x=9x-13
We move all terms to the left:
40+20x-(9x-13)=0
We get rid of parentheses
20x-9x+13+40=0
We add all the numbers together, and all the variables
11x+53=0
We move all terms containing x to the left, all other terms to the right
11x=-53
x=-53/11
x=-4+9/11
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